How to add identity specification to a primary key column

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hello all,

i have a table named Tax , which has columns (TaxId, TaxPercentage).
TaxId is primarykey. Now i want to set TaxId to be identity.
How to do this.

I cannot use designer to do this as sql-server2008-R2 is not allowing me to use designer for already existing table. I searched alot for this on google but was unable to find the right query.

Posted 18-Apr-12 1:48am

ujjwal uniyal

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3 solutions

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*Karthik Harve* · Answer 1 · 2012-04-18T01:57:00

Solution 1

check these links..

sqlserver primary key constraints and unique key constraints[^]

sqlserver how to drop primary key contraint[^]

sqlserver add or remove identity property on column[^]

hope it helps

Posted 18-Apr-12 1:57am

Karthik Harve

gqadirshabbir · Answer 2 · 2012-04-18T01:57:00

Solution 2

SQL

IF OBJECT_ID ('Tax', 'U') IS NOT NULL
   DROP TABLE Tax;
GO
CREATE TABLE Tax
(
 TaxId int IDENTITY(1,1),

);

Posted 18-Apr-12 1:57am

gqadirshabbir

Updated 18-Apr-12 2:01am

v2

Comments

Karthik Harve 18-Apr-12 8:02am

[Edit] pre tags added.

Nilesh Patil Kolhapur · Answer 3 · 2012-04-18T02:06:00

Solution 3

hey,

to alter existing table try following

SQL

Alter Table Tax
Add TaxId_new Int Identity(1, 1)
Go

Alter Table Tax Drop Column TaxID
Go

Exec sp_rename 'Tax.TaxId_new', 'TaxID', 'Column'

Hope it will help u
Best Luck
Happy Coding :)

Posted 18-Apr-12 2:06am

Nilesh Patil Kolhapur

Updated 18-Apr-12 2:07am

v2